deface
Pronunciation:
/diːˈfeɪs/verb
Definitions
To damage or vandalize something, especially a surface, in a visible or conspicuous manner.
Example: After the painting was defaced a decade ago, it went viral and has been a tourist attraction ever since.
To void or devalue; to nullify or degrade the face value of.
Example: He defaced the I.O.U. notes by scrawling "void" over them.
(flags) To alter a coat of arms or a flag by adding an element to it.
Example: You get the Finnish state flag by defacing the national flag with the state coat of arms placed in the middle of the cross.